Chemical formulas show the number and type of atoms in the smallest representation of a substance.
In the field of chemistry, a chemical formula can be described as a representation of the different kinds of chemical elements that are present in a chemical reaction. The chemical formula also shows the number of atoms for each of the atoms that will be present in a chemical reaction or a chemical compound.
As chemical formulas only represent the types and no.of atoms, they are known to be the smallest representation that helps us to know what is present in a substance and what is the number of atom ratio of one element compared to another in that substance.
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